I just finished that mission (after playing it two times before without finishing it) and had no problems whatsoever. I'm on Ubuntu 13.04 64bit Phenom II CPU and Nvidia GTX 650 Ti GPU, maybe it is Linux and hardware related.

Im running it on Ubuntu 12.04 LTS 64bit with Athlon II CPU and ATI HD4770 GPU and the game starts but will not load the mission at all it goes back to the desktop again. I tried lowering the settings to the lowest and then the mission started but it goes back to the desktop again.